Seveso disaster
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The Seveso disaster was a chemical accident. It happened in an industrial plant in the Italian town of Seveso. That town in Lombardy, near Milan has about 20.000 people living there.
The industral disaster happened on July 10 1976 near that town. The disaster meant that a lot of the toxic (poison) dioxin called TCDD got into the environment.
Officially, the disaster caused no human deaths. However, 3,000 farm animals and pets died, and another 70,000 animals had to be killed to stop the dioxin from getting in the food chain.